Some features of jump in water temperature in aSargassum forest

Komatsu, Toshimitsu; Murakami, Shin-ichi; Kawai, Hideo

doi:10.1007/bf02236535

Cited by 15 publications

(5 citation statements)

References 7 publications

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“…Sargassum forests have important influences on coastal marine environments. For example, seaweeds affect the spatial and temporal distribution of water temperature (Komatsu et al 1982 , 1994 ; Komatsu 1985 ), downward illumination via shading by their canopies (Komatsu 1989 ; Komatsu et al 1990 ), pH (Komatsu and Kawai 1986 ), and dissolved oxygen content by their respiration and assimilation (Komatsu 1989 ). They can also slow water flow (Komatsu and Murakami 1994 ), and they play vital ecological roles as spawning, nursery, and feeding grounds for marine animals (e.g., Thiel and Gutow 2005 ; Abé et al 2012 ).…”

Section: Introductionmentioning

confidence: 99%

Unusual distribution of floating seaweeds in the East China Sea in the early spring of 2012

Komatsu¹,

Mizuno²,

Natheer³

et al. 2013

J Appl Phycol

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Floating seaweeds play important ecological roles in offshore waters. Recently, large amounts of rafting seaweed have been observed in the East China Sea. In early spring, juveniles of commercially important fish such as yellowtail accompany these seaweed rafts. Because the spatial distributions of seaweed rafts in the spring are poorly understood, research cruises were undertaken to investigate them in 2010, 2011, and 2012. Floating seaweed samples collected from the East China Sea during the three surveys contained only Sargassum horneri. In 2010 and 2011, seaweed rafts were distributed only in the continental shelf and the Kuroshio Front because they had become trapped in the convergence zone of the Kuroshio Front. However, in 2012, seaweed was also distributed in the Kuroshio Current and its outer waters, and massive strandings of seaweed rafts were observed on the northern coast of Taiwan and on Tarama Island in the Ryukyu Archipelago. Environmental data (wind, currents, and sea surface height) were compared among the surveys of 2010, 2011, and 2012. Two factors are speculated to have caused the unusual distribution in 2012. First, a continuous strong north wind produced an Ekman drift current that transported seaweed southwestward to the continental shelf and eventually stranded seaweed rafts on the coast of Taiwan. Second, an anticyclonic eddy covering northeast Taiwan and the Kuroshio Current west of Taiwan generated a geostrophic current that crossed the Kuroshio Current and transported the rafts to the Kuroshio Current and its outer waters. Such unusual seaweed distributions may influence the distribution of fauna accompanying the rafts.

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Section: Introductionmentioning

confidence: 99%

Unusual distribution of floating seaweeds in the East China Sea in the early spring of 2012

Komatsu¹,

Mizuno²,

Natheer³

et al. 2013

J Appl Phycol

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“…They typically form dense sargassacean forests with high annual production and biomass (Yatsuya et al. 2005, 2007), creating a stable living environment, sheltering significant biodiversity and playing an important role in the life history of numerous coastal organisms (Komatsu et al. 1996; Rossier & Kulbicki 2000; Godoy & Coutinho 2002).…”

Section: Introductionmentioning

confidence: 99%

Phylogeographic heterogeneity of the brown macroalgaSargassum horneri(Fucaceae) in the northwestern Pacific in relation to late Pleistocene glaciation and tectonic configurations

et al. 2011

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Pleistocene glacial oscillations and associated tectonic processes are believed to have influenced the historical abundances and distribution of organisms in the Asia Northwest Pacific (ANP). Accumulating evidence indicates that factors shaping tempospatial population dynamics and distribution patterns of marine taxa vary with biogeographical latitude, pelagic behaviour and oceanographic regimes. To detect what kinds of historical and contemporary factors affected genetic connectivity, phylogeographic profiles of littoral macroalga Sargassum horneri in the ANP were analysed based on mitochondrial (Cox3) and chloroplast (rbcL) data sets. Five distinct clades were recovered. A strong signature of biogeographical structure was revealed (Φ(CT) = 0.487, P < 0.0001) derived from remarkable differentiation in clade distribution, as clade I is restricted to Chinese marginal seas (Yellow-Bohai Sea, East China Sea and South China Sea), whereas clades II-V are discontinuously scattered around the main Islands of Japan. Furthermore, two secondary contact regions were identified along the south Japan-Pacific coastline. This significant differentiation between the two basins may reflect historical glacial isolation in the northwestern Pacific, which is congruent with the estimates of clade divergence and demographic expansion during the late Quaternary low sea levels. Analysis of molecular variance and the population-pair statistic F(ST) also revealed significant genetic structural differences between Chinese marginal seas and the Japanese basin. This exceptional phylogeographic architecture in S. horneri, initially shaped by historical geographic isolation during the late Pleistocene ice age and physical biogeographical barriers, can be complicated by oceanographic regimes (ocean surface currents) and relocating behaviour such as oceanic drifting.

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“…There are about 60 species of seagrasses in the world, which belongs to submerged angiosperms [1]. They may influence marine environments such as buffering water motion [6], stabilizing bottom sediments [7,8], changing underwater light and water temperature by canopy shading, oxygen contents and pH by respiration and photosynthesis similar manners to seaweed beds [9,10,11,12,13,14]. Seagrass meadows play significant roles through providing habitats, improving water quality and contributing to the food chain [3,15,16].…”

Section: Introductionmentioning

confidence: 99%

Marine habitat mapping: using ALOS AVNIR-2 satellite image for seagrass beds at Rabbit (Koh Tonsay) Island, Cambodia

et al. 2012

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The coastline of Cambodia stretches along the Gulf of Thailand including 69 islands. It supports rich diversity of marine species. Distributions of habitats including mangroves, coral reefs and seagrass beds along the pristine Cambodian coast still remains unknown compared to neighboring countries, Thailand and Vietnam. Cambodian seagrass beds form habitats with rich biodiversity and economical value through marine ecosystem services playing as a key role against climate change by reserving large amount of carbon. However, the general status of these seagrass habitats is poorly researched and documented. Satellite image of Advance Visible and Near Infrared Radiometer type 2 (ALOS AVNIR-2) with high resolution (10x10m) provides good information for seagrass habitat mapping. Study site was selected around Rabbit (Koh Tonsay) Island with area of 2 km 2 . The objectives of this study are (1) to know spatial distribution of seagrass beds around this island by ground survey and (2) map seagrass beds using the ALOS AVNIR-2 image with ground truthing data. Ground truth survey was conducted in June 2011. Surveys along three transect lines revealed 8 species of seagrasses belonging to Hydrocharitaceae (4 species) and Cymodoceaceae (4 species) around the island. We analyzed ALOS AVNIR-2 taken on 22 December 2009 to map distribution of seagrass beds around Koh Tonsay Island. Results showed that remote sensing using ALOS AVNIR-2 data provides a practical tool for mapping seagrasses beds around the island and information for future management and conservation of seagrass beds in Cambodia.

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Some features of jump in water temperature in aSargassum forest

Cited by 15 publications

References 7 publications

Unusual distribution of floating seaweeds in the East China Sea in the early spring of 2012

Unusual distribution of floating seaweeds in the East China Sea in the early spring of 2012

Phylogeographic heterogeneity of the brown macroalgaSargassum horneri(Fucaceae) in the northwestern Pacific in relation to late Pleistocene glaciation and tectonic configurations

Marine habitat mapping: using ALOS AVNIR-2 satellite image for seagrass beds at Rabbit (Koh Tonsay) Island, Cambodia

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